Improvement in head-blocks



iran *STATES PATENT @Ferca JOHN COOK, OF BALTIMORE, MARYLAND, ASSIGN OR TO AGEORGE PAGE a oo.,\oi1 SAME PLAGE.

IMPROVEMENT lNHi-:AD-BLocKs.

Specification forming part of `Letters Patent No. 165,065, dated J une 29, Vl-S'i; application filed May 10,1875. t

To all whom it may concern Beit known thatl, JOHN F. (100K, ofthe cityof Baltimore and State of Maryland, have invented certain new and useful Improveinents in Head-Blocks, of which the following 1s a specilication5 and I do hereby declare 4that in the same is contained a full, clear, and exact description of my said invention, reference being had to the accompanying drawing and to the letters of reference marked thereon.

My invention relates to means whereby the log-beam, to which the log is indirectly secured, is moved laterally of the saw-carriage u pon which it rests; and to improvements in the set-outs to which the side of the log is directly attached, which set-outs are made adjustable laterally of the log-beam, to admit of the placing of the log in an angular position with reference to the plane of revolution of the saw.

My invention consists, rst, in the adaptation' to the upper surface of the saw-carriage ot diagonal slides, grooved longitudinally to admit of the longitudinal motion therein of rollers projecting from the under side of two or. more cross-heads, sustained movably in suitable guides, and rigidly connected to a toothed rack adapted to be moved, together with bars extending therefrom, leiithwise of `the log-beam, in asuitable depression therein, as hereinafter described. My invention consists, secondly, in a certain combination of movable parts, attachments to the set-outs, by means of which the adjustment of the setouts independently of the log-beam is accomplished.

In the further description of my invention which follows due reference must be had to the accompanying drawing, forming a part of' this specilicatioii, and in which* Figure l is a plan of my improved sawcarriage and its attachments, and Fig. 2 a similar view of the same with the logbeam and a portion of its connections removed. Fig. 3 is a side view of theimproved saw-carriage, and Fig. 4. a cross-section of the same.

\ Similar letters of reference indicate similar partsin all the gures.

A 1s the saw-carriage proper, ttcd with wheels a, which run upon the track b. B is the log-beam, supported by the log-bearers o, extending across the carriage A. The movement of the saw-carriage and attachments upon the track is caused by mechanism, which, as it forms nopart of the present iiiventioii, is not illustrated inthe drawing. The adjustable set-outs before alluded to, and which are represented by C, are confined in slides cl secured to the upper face of the logbeam. The mechanism by means of `which the set-outs are adjusted, and their projection beyond the outer edge ot' the log-beam regulated, consists in the worin-wheels c, which are operated through the medium ofthe halidwheelsif, the spirally-toothed piiiions g, and

the correspon'diiigly-toothed racks h. The conm joined movement of the log-beain and set-outs laterally of the saw-carriage, as aforesaid, is attained by means of the following combination of parts: D D are grooved slides secured diagonally to the upper face of the carriage, and adapted to receive the rollers t' projecting from the cross-heads E, which are connected by the toothed rack E', and constructed to move iii suitable guides. The longitudinal motion of the rollers, cross-heads, and toothed rack, is caused by the revolution o f a pinion, It,

fastened to t-he vertical shaft l, which is supported within a frame, m. The revolution of the pinion lc is obtained in two ways: one by means of the mitered or beveled gear-wheels n n', through the medium of the ratchet-lever o, and the other directly from the hand-wheel p. The former method lproduces a slow motion, which may be graduatei'l and adjusted to regulate the thickness of the slab or board sawed, and is adapted to the forward movement ot' the log-beain when the log is attached thereto for the purpose of being sawed and the lat-xi ter one a motion which, owing to its rapidity, is specially applicable to the backward movement of the log-beam when relieved of the weight of the log. To obtain the direct movenient of the pinion lt, independently ofthe ratchet-lever, the gear-wheel n, with its shaft l, is elevated by means of the handle F, which fits over a projection onthe upper part of the frame m, and is provided with a pin, which enters a spiral groove in the said projection.

As the cross-heads E and toothed rack are kmoved longitudinally of. the logfbeam through the agency ofthe mechanism above-described, the rollers t' are forced into contact with the inclined sides oi' the grooves in the slides l), and by taking their direction are carried with their attachments laterally oi' the saw-carriage as Well as longitudinally of the log-beam.

Having thus described my invention what I claim as new, and desire to secure by Letters Patent of the United States, is

1. The log-beam B, cross-heads and rack E E', grooved diagonal slides D, rollers z', pinion la, and shaft l, combined substantially as and for the purposes specified.

the log-beam B,

2. The combination of frame m, shaft l, pinion 7c, gears n n ,and hawV dle F, whereby the log-beam can be moved laterally on two ways, substantially as herein described.

3. The log-beam B, provided with the slides d, and spirally-toothed racks h, in combination with the set-outs C, having the,worm Wheels e, and spirally-toothed pinions g, substantially as and for the purposes specified.

In testimony whereof l have hereunto subscribed my name this 30th day of April, A.

JOHN F. COOK.

Witnesses: y

WM. H. H. YOUNG, WM. T. HOWARD. 

